RX400h · Service Manual RESTRAINTS

B1153/25

Diagnostic trouble codes

DESCRIPTION

The seat position sensor circuit consists of the center airbag sensor assembly and the seat position sensor.
DTC B1153/25 is recorded when a malfunction is detected in the seat position sensor circuit.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1153/25
  1. Open circuit in LSP+ wire harness or LSP- wire harness of seat position sensor
  2. Short circuit in seat position sensor wire harness (to ground)
  3. Short circuit in seat position sensor wire harness (to B+)
  4. Seat position sensor malfunction
  5. Center airbag sensor assembly malfunction
  1. Seat position sensor
  2. Center airbag sensor assembly
  3. Floor wire No.2 (LHD)
  4. Floor wire (RHD)

WIRING DIAGRAM

H043377E01

INSPECTION PROCEDURE


1. CHECK VEHICLE STEERING POSITION

  1. Check the vehicle steering position.

    Result:
    A:
    LHD
    B:
    RHD



 B
Go to step 10
A


2. CHECK DTC

  1. C110471E01
    Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK

3. CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the seat position sensor.

    OK:
    The connectors are connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


4. CHECK FLOOR WIRE NO.2 (OPEN)

  1. C110472E02
    Disconnect the connectors from the center airbag sensor assembly and the seat position sensor.

  1. Using a service wire, connect A23-4 (LSP+) and A23-3 (LSP-) of connector "B".

    HINT:
    Do not forcibly insert a service wire into the terminals of the connector when connecting.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (LSP+) -
    B9-4 (LSP-)
    		 Always
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


5. CHECK FLOOR WIRE NO.2 (SHORT TO B+)

  1. C111660E02
    Disconnect the service wire from connector "B".

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (LSP+) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    B9-4 (LSP-) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


6. CHECK FLOOR WIRE NO.2 (SHORT TO GROUND)

  1. C111660E02
    Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (LSP+) -
    Body ground
    		 Always
    		 1 MΩ or higher
    B9-4 (LSP-) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE NO.2
OK


7. CHECK SEAT POSITION SENSOR

  1. C110471E01
    Connect the connectors to the seat position sensor and the center airbag sensor assembly.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
Go to step 8
OK

USE SIMULATION METHOD TO CHECK

8. REPLACE SEAT POSITION SENSOR

  1. Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Replace the seat position sensor (Click here).

    HINT:
    Perform the inspection using parts from a normal vehicle if possible.


NEXT


9. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. C110471E01
    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

END

10. CHECK DTC

  1. C114786E01
    Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
Go to step 11
OK

USE SIMULATION METHOD TO CHECK

11. CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the seat position sensor.

    OK:
    The connectors are connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


12. CHECK FLOOR WIRE (OPEN)

  1. C114787E02
    Disconnect the connectors from the center airbag sensor assembly and the seat position sensor.

  1. Using a service wire, connect A25-1 (RSP+) and A25-2 (RSP-) of connector "B".

    HINT:
    Do not forcibly insert a service wire into the terminals of the connector when connecting.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (RSP+) -
    B9-4 (RSP-)
    		 Always
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE
OK


13. CHECK FLOOR WIRE (SHORT TO B+)

  1. C114788E06
    Disconnect the service wire from connector "B".

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (RSP+) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    B9-4 (RSP-) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE
OK


14. CHECK FLOOR WIRE (SHORT TO GROUND)

  1. C114788E06
    Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    B9-2 (RSP+) -
    Body ground
    		 Always
    		 1 MΩ or higher
    B9-4 (RSP-) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK


15. CHECK SEAT POSITION SENSOR

  1. C114786E01
    Connect the connectors to the seat position sensor and the center airbag sensor assembly.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
Go to step 16
OK

USE SIMULATION METHOD TO CHECK

16. REPLACE SEAT POSITION SENSOR

  1. Turn the ignition switch to the LOCK position.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Replace the seat position sensor (Click here).

    HINT:
    Perform the inspection using parts from a normal vehicle if possible.


NEXT


17. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. C114786E01
    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Check the DTCs (Click here).

    OK:
    DTC B1153/25 is not output.

    HINT:
    Codes other than code B1153/25 may be output at this time, but they are not related to this check.



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

END


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